<table border="0" cellspacing="10" cellpadding="0">
  <tr>
    <td><label for="topic_title">标题</label><span class="tip">(必填)</span></td>
    <td><%= form.text_field :title %></td>
  </tr>
  <tr>
    <td><label for="topic_content">内容</label></td>
    <td><%= form.text_area :content %></td>
  </tr>
</table>